Moltmann derives much of the power of his theology from his willingness to endure the tensions of paradox, a willingness signalled early in his career with the title of his work, The Crucified God. Such paradoxes, however, leave unanswered questions and the need for further explorations. It is the argument of this article that an aspect of Moltmann's theology in particular need of exploration is the area of the status of Christian doctrine and its appropriate development. There is a major tension, we will suggest, between the disavowal of‘doctrine’, ‘dogma’, ‘tradition’ and ‘system’ as helpful concepts, and the strongly doctrinal and systematic content of Moltmann's theology. This tension, we believe, has something to do with the ambivalence in Moltmann's attitude to the intellectual legacy of the Enlightenment, to ‘modernity’. We shall try to show that Moltmann operates with a mixture of internal criteria (based on key doctrines) and external criteria (based on perceived human needs) for assessing authenticity in doctrine. Finally, within the dynamic of Moltmann's theology, with what we shall identify as its emphasis on historicality, there are resources for advancing an account of the theological significance of the development of doctrine. We explore these and ask why Moltmann himself has not put them to greater use.